code: def test_depth(tmpdir):
      scene = Scene(resolution=(5, 7), frame_end=1)
  
      renderer = Blender(scene)
  
      # --- populate the scene with a cameras inside a large ball
      scene += objects.Sphere(scale=10, position=(0, 0, 0.0))
      scene += cameras.PerspectiveCamera(
          name="camera", position=(0, 0, 0), look_at=(1, 0, 0)
      )
  
      # the depth map should give a constant value equal to the radius of the sphere
      frames = renderer.render_still()
      np.testing.assert_allclose(frames["depth"], 10, atol=0.01)
  
file_path: kubric/test/test_postprocessing.py
imports: from kubric.renderer import blender_utils
  from kubric.core.scene import Scene
  from kubric.core import cameras
  from kubric.core import objects
  from kubric.renderer.blender import Blender
  import numpy
  import pytest
label_desc: Use image node_id 3 for calling a global function with example usage: test_depth(tmpdir) without return types